This is great.
I think the best part is how he only gradually moves into the Megatron voice. If you listen to this without knowing who he is or the title of the video, but know the Megatron voice, you'd probably have a sudden realization that "Holy cheese, that's Beast Wars Megatron!"
Who, by the way, is still the best Megatron.
There's another great thing: In the comments on the video, David Kaye thanks people for complimenting him on the video, saying that they've made his Christmas by being his fans, and then says he needs to go shave off his five o'clock shadow.
Kaye is a class act, man.